Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
  • B25B13/00—Spanners; Wrenches
  • B25B13/10—Spanners; Wrenches with adjustable jaws
  • B25B13/12—Spanners; Wrenches with adjustable jaws the jaws being slidable
  • B25B13/14—Spanners; Wrenches with adjustable jaws the jaws being slidable by rack and pinion, worm or gear
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
  • H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
  • H01B5/08—Several wires or the like stranded in the form of a rope
  • H01B5/10—Several wires or the like stranded in the form of a rope stranded around a space, insulating material, or dissimilar conducting material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
  • B25B13/00—Spanners; Wrenches
  • B25B13/10—Spanners; Wrenches with adjustable jaws
  • B25B13/12—Spanners; Wrenches with adjustable jaws the jaws being slidable
  • B25B13/20—Arrangements for locking the jaws
  • B25B13/22—Arrangements for locking the jaws by ratchet action or toothed bars
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49002—Electrical device making
  • Y10T29/49117—Conductor or circuit manufacturing

Definitions

• the present invention relates to a gap-type overhead transmission line and its manufacturing method, and more particularly to an overhead transmission line configured to have a gap between a steel core and a conductor and its manufacturing method.
• an overhead transmission line such as an overhead power cable, an overhead branch line and OPGW (Optical Ground Wire) is constructed using electric poles or transmission towers, and its temperature is changed depending on external environments such as atmospheric temperature, wind and solar light, and current flowing through the line. Such temperature change causes contraction and expansion of the line, which results in change of sag of the overhead transmission line.
• a tension between transmission towers is controlled or an electric spacing distance from the ground is determined. That is to say, a maximum allowable current of an overhead transmission line is limited due to the sag of the line.
• the loose-type overhead transmission line is configured so that common aluminum cable steel reinforced is prepared and then a gap is mechanically formed between the steel core and the aluminum strand wire during installation so as to share a tension with the steel core.
• the gap-type overhead transmission line is configured so that a gap is formed between the steel core and the aluminum strand wire when the line is produced.
• FlGs. 1 and 2 are schematic views showing an example of a conventional overhead transmission line manufacturing method respectively.
• FlG. 3 is a schematic view showing another example of a manufacturing method of a conventional overhead transmission line.
• the present invention is designed in consideration of the above problems, and therefore it is an object of the invention to provide a gap-type overhead transmission 1 ine configured so that a gap is formed using a sublimate material between a steel core and a conductor, and its manufacturing method.
• the present invention provides a gap-type overhead transmission line, which includes a steel core member; a conductor layer positioned to surround the steel core member and having at least one strand wire aggregated therein; and a coating layer interposed in a solid state between the steel core member and the conductor layer so as to surround the steel core member, the coating layer including a material that is sublimated after the conductor layer is stranded so as to form a predetermined gap between the steel core member and the conductor layer.
• the coating layer has a thickness of 0.1 mm to 10 mm.
• the coating layer includes naphthalene, dry ice or ice.
• a loose rate of the steel core member and the conductor layer is in the range of 0.1 to 0.5%.
• a method for manufacturing a gap-type overhead transmission line which includes (a) providing a steel core member; (b) forming a coating layer of a predetermined thickness with a sublimate material so as to surround the steel core member; (c) stranding a conductor layer having at least one strand wire aggregated therein around the coating layer; and (d) forming a predetermined gap between the steel core member and the conductor layer by means of phase change of the coating layer.
• the sublimate material includes naphthalene, dry ice or ice.
• the coating layer has a thickness of 0.1 mm to 10 mm.
• a preformed strand wire is stranded.
• a loose rate of the steel core member and the conductor layer is in the range of 0.1 to 0.5%.
• FlGs. 1 and 2 are schematic views showing a conventional method for manufacturing an overhead transmission line respectively;
• FlG. 3 is a schematic view showing another example of a conventional manufacturing method of an overhead transmission line
• FlGs. 4 to 7 are sectional views subsequently showing a method for manufacturing a gap-type overhead transmission line according to a preferred embodiment of the present invention.
• FlGs. 4 to 7 are sectional views showing a method for manufacturing a gap-type overhead transmission line according to a preferred embodiment of the present invention, respectively.
• a steel core member 30 is prepared.
• the steel core member 30 is preferably configured so that seven steel core strand wires 32 having aluminum cladding are stranded in a predetermined shape (7-core strand wires).
• 7-core strand wires the number, shape and material of the steel core strand wires 32 may be changed depending on capacity of the overhead transmission line or the like.
• the cladding and stranding processes may adopt conventional ones.
• sublimate material such as naphthalene, dry ice or ice is coated around the steel core member 30 having 7-core strand wire structure to form a coating layer 40.
• the coating layer 40 has a thickness identical to a width of the gap G between the steel core member 30 and the conductor layer 50 as described later, and this thickness should be suitably selected.
• the coating layer 40 preferably has a thickness of 0.1 mm to 10 mm. In case the coating layer 40 has a thickness less than 0.1 mm, the gap generated by the coating layer 40 has a small width, so improvement of performance of the overhead transmission line is not expected.
• an optimal thickness of the coating layer 40 is about 0.6 mm. This value may maximize the performance of the overhead transmission line together with minimizing increase of its outer diameter.
• the thickness of the coating layer is defined as a thickness of the coating layer at an outermost portion of the steel core member 30.
• a conductor is stranded around the coating layer 40 to form a conductor layer 50.
• Aluminum or its alloys such as H- 1350, AA6201, TAL and STAL may be preferably used for forming the conductor layer 50.
• the conductors used for forming the conductor layer 50 preferably employ preformed strand wires. This prevents the conductor strand wires from getting loose when being stranded.
• a common method is used for the preforming work. Meanwhile, the number of layers of the stranded conductor layer 50 may be adjusted as desired according to a necessary capacity of an overhead transmission line.
• the loose rate is less than 0.1%, sag of the overhead transmission line caused by its looseness is not effectively prevented. If the loose rate is greater than 0.5%, a birdcage phenomenon (a phenomenon in which strand wires become wider like a birdcage when gaps between strand wire layers are great) may occurs during stranding or installation.
• the gap-type overhead transmission line and its manufacturing method according to the present invention may reduce or restrain sag of an overhead transmission line by forming a gap using a coating layer made of sublimate material between a steel core member and a conductor layer, and thus a transmission capacity of the overhead transmission line may be increased.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Non-Insulated Conductors (AREA)

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Citations (7)

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• 2005
  • 2005-03-11 KR KR1020050020708A patent/KR100602291B1/ko not_active IP Right Cessation
• 2006
  • 2006-01-09 WO PCT/KR2006/000081 patent/WO2006095959A1/en active Application Filing
  • 2006-01-09 JP JP2007557926A patent/JP2008532241A/ja active Pending
  • 2006-01-09 US US11/719,695 patent/US20090114419A1/en not_active Abandoned
  • 2006-01-09 CN CNA2006800004627A patent/CN1989574A/zh active Pending

Patent Citations (7)

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